Applied bacteriology : an introductory handbook .. / by T.H. Pearmain and C.G. Moor.

  • Pearmain, T. H.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Applied bacteriology : an introductory handbook .. / by T.H. Pearmain and C.G. Moor. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    diameter, occur as diplococci and in short streptococci. In old cultures they lose their motility, but on inoculating into a saccharine liquid they regain their power of move- ment. It will grow at 37° C. Cultural characters : Gelatine Tubes. —k pinkish-red expansion is formed. The gelatine is very slowly Hquefied. Agar-Agar—k pinkish-red expansion is produced. Potatoes.—k pinkish-red growth is produced. Bacillus AquatiUs.—Is found in water. It forms short straight bacilli, three times as long as they are broad, they occurring singly and in chains. This organism is anaerobic, and will not grow above about 24° C. It reduces nitrates to nitrites. Does not stain by Gram's method of staining. Cultural characters: Gelatine Plates.—Forms mother-of-pearl-like dots, both on the surface and in the depth. By age the colonies become more raised, but do not grow in width. The gelatine is not liquefied. Agar-Agar.—A moist white expansion is formed, which only grows at room-temperature. Potatoes.—A gray-white irregular expansion forms, after- wards becoming of a coffee-yellow colour. Bacillus Arborescens. — This organism was found by Frankland in river-water. It forms slender bacilli about 2*5 [JL long by 0*5 /i broad, and occurs in twos and threes, also in long chains. Cultural characters : Gelatine Plates.—Branching wheatsheaf-like colonies are produced, having a beautiful iridescent appearance. The gelatine is slowly liquefied. Gelatine Tubes.—The medium is slowly liquefied, pro- ducing a yellow deposit. Agar-Agar.— A dirty orange-coloured growth is slowly produced. Potatoes.—A deep orange growth is produced.